Sewing machine



2 Sheecs-Sheiet l INVE NIT-(DS1 March 15, 1938. A. HANDSCHUH SEWING MACHINE Filed July 5, 1935 March 1j5, 1938. A. HANDscHuH 2,111,394

SEWING MACHINE Filed July 5, 1955 2 Sheets-Sheet 2 Y Patented Mar. 11938K PATENrv OFFICE SEWING MACHINE Anton Handschuh,l Berlin, Germany Application July i5, 1935, Serial 1\To.f29,889v In Germany JulyA 8, 1934 13 Claims. The present invention relates to a sewing machine of the needle feeding type and more particularly to sewingmachines of this type but in which the customary feed dog has been preserved n 5 and which are adapted to zigzag stitching. The object of the invention is to provide for a sewing machine which can be operated either with the usual feed dog below the work or with the combined feed dog and needle feed, in order that the well-known advantage of the needle feed, viz. to prevent the upper layer of fabric from lagging behind thel lower one when a plurality of layers of fabric are sewed together, is made available. 0nv the other hand it is indispensable that the sewing operation can be carried out with only the lower feed dog for ordinary sewing work, so e. g., hemming, curling,.ruiiiing etc. means supplied with every sewing machine a would be useless for machines working with the feed dog and needle feed at the same time. Sew. ing machines working with the `combinedieed dog and one or multiple needle feedare known per se as special machines. But in thev case of. such machines it has, not yet been possible to` work withthese machines in theusual'way, viz. with Ithe lower feed dog4 only, as inthe special vmachines referred to the feed dog advances the fabric while the needle is introduced" Vin the fabric, whereas in. the usual sewingoperation, where the needle? does not partake of' the advance, the advance must be accomplished by the feed dog when the .needle is clear of the work. According to the. invention the machine is ren'- dered serviceable for -either purpose vin such a way that, while the moveni'nt of the needle in the' directionfof advancelcan be eliminated at will, the penetration of the needle into lthe fablric is rendered dependent on the action of the feed dog, this action 4being'o controllable that 40 the advance of the feed dog may, according to theparticular case, beaccomplishedwhen the needle is either within or outside the fabric. This is arrived at in a' simple manner in that the eccentric .or intended forl producing` thefeeding movement ofsrespectively the feed dog and `the,need(1e"i.s jloosely mountedy on the 4 driving shait- 'which is toV 'produce theyertical f reciprocation ofthe needle, and can be iixedin w several positions `required while theneedic bar can be'disenga'ged from the means producing of thatbar." The embodiment -of the is thus intended for a sewing machine which can be operated with the usual feed (Cl. 11H06) :in section and dog only, which acts below the work, or with the combined feed dog and needle feed. V

A further object of the present invention is to provide for such a sewing machine which can be optionally used with the lower feed :dog only 5 or with thecombined feed dog and needle feed and which can be additionally arranged fora third possibility of use, viz. the production of zigzag stitches. To this end the needle bar frame is suspended by a universal joint onthe like in i0 the head of the machine which is provided with a device by which the swinging movement of the needle bar'as produced in the direction of ad 'Vance can be converted into a movement taining place at right angles to the direction of ad- 15 Vance, and inversely. When zigzag stitches are to be obtained, the driving eccentric intended for producing the feed dog and, needle advance movements must be so set thatnthe advance of the feed dog takes place when the needle is 20 clear of the fabric. Then the drive of the swingt ing movement of the needle bar frame is rendered inoperative but the driving gear producfing the swinging movement thereof transversely to the direction of advance is switched in. f

The accompanying drawings show the two said 4 embodiments of the invention and represent in- Fig. 1 a side elevation of theiirst embodiment,v Fig; -2 a top -plan view thereof. both partially substantially showing only the 30 essential members adapted to respectively pro- Vduce and change the two swinging movements of the needle bar,

Fig. 3 a longitudinal Asection .through the head embodiment referred to. A

Fig. 4; a front elevation of the said head,

'and 4 l 6 a top plan view of the needle plate. The main shaft iintended for prodwcing'the vertical reciprocation of the needle is mounted in ofthe arm-of the sewing machine and is Adriven in the bythe wheel' I.; The' main'shaft l carries a double eccentric! which 45 islooselymounted thereon and connectedfthrough- .eceenmemauengwtorungsnamsdisped hmvjtnemaemm producing the parallelogram movementtor the 'Ihecoll'ar .fisuaedasanabutmentso for the other'side ofthe said eccentric there irdilp aeoupling sleeve1 displaceable on the shaft iin a 'lengthwisev direction but secured againstannlklar relativeiythercto, this sleeve bess csf wenn: maintenues-zer.

Knevel-01111181 shaft l whlleon the -sleeve 22 at the joint thereof. A

ing continuously pressed against the eccentric 3 by a pressure spring 9 the opposite end of which bears against another collar 9 carried by the main shaft l. The said coupling sleeve is provided with a pin I engaging with'a bore Il of the eccentric 2. The swinging movement of the needle in the direction of advance is produced in the usual manner, e'. g. by a shaft I8 mounted in bosses I9 and I9' of the arm of the sewing machine. Shaft Itis coupled byim'eans of a curved lever 21 to the crank arm 28 which connects the eccentric rod 4 to one of the rocking shafts 5. A'lever Nels fastened by means'of a pin on the said shaft II and pivoted to the needle bar 2I. When the eccentric l rotates, the eccentric rod 4 imparts a swinging movement -to the crank arm 28. Lever 21 `transmits this movement to shaft Il and lever 20 keyed to the latter. A swinging movement of the needle synchronous 200with the reciprocation of the feeding dog is obtained because the other end of lever 2l) is slidably pivoted to the needleiar 2I. In order that the swinging movement resulting in the needle advance can be eliminated, the shaft I8 is divided into two halves and provided with a coupling catch 23 is slidably mounted on one of these shaft halves ,and

. secured against angular displacement by groove and tongue 24.` A projection 25 of the saidv catch engages a corresponding notchof the sleeve sel cured on .the other half of the shaft I8. By means of the screw 26 the said catch is. clamped in respectively the operative and inoperative positions. The swinging movement of the needle may also be prevented by any other suitable means. When the sewing machine working with thecombined needle and' feed dog feeds'is'to be adapted to ordinary sewing with the lower feed dog only, it becomes necessary in the first place, to disconnect the needle feed, i. e. prevent movement of the'needle bar in the horizontal plane. This may be effected for instance by adjusting the coupling22. In such event, it is also necessary to adjust the operating cycle of the needle movementwith respect to the feed dog operation, because the ordinary feed-dog construction provides. for the advancement of the workpiece in the raised position of the needle, while in the vcase of a combined feed-dog and needle feed the workpiece is advanced in the lower position of the needle. This adjustment of the operating cycle of the needle movement with respect to the feed dog is produced by the adjustment of the coupling sleeve 1 by means of a lateral pin head l2 disposed within the arm of the machine and y subject to the pressure of a spring, which `pin head I2is operated manually by a pressure being exerted on the button I 3 of the. pin, when a cam I4- of the said pin head I2 acts as a wedge on the thereof. While the coupling sleeve is being so the said coupling sleeve is turned.

turned, a nose I6 oi' the'pin head I2 at the same time engages a notch I 1y of the eccentric 3 so as to secure the same against being taken along when After the advance ofthe needle bar has been so eliminated the needle bar.2I is held in the head of the sewing machine in its vertical position for' reciprocation, e. g. by means of an adjustable pinv 2 I b which can be shifted into an axially disposed slot 2Ia in the needle bar 2i to prevent the latter from swinging in the direction of advance, without interfering with the vertical reciprocal movement thereof. l

In order that the machine can also be used for making zigzag stitches a needle bar frame 29 is, by means of a suitable universal joint, such as a Cardan joint 30, 3i, 32, a ball joint or the like, mounted in the head of the sewing machine so that the needle bar 2| guided in the said frame 29 can be swung both in the sewing direction and in another direction .transversely to the latter. In order that theswinging movement of the needle bar frame is changed lfrom one of the said directions to the other direction and the said frame is allowed toswing in the particular direction and prevented from swinging in the other di'- rection, its lower end is enclosed by a guide'frame 33with a clearance which sumces for the largest amplitude of theswinging movement of the needle ba'r frame in either direction. 'I'he "said guide frame 33 is slidably mounted for vertical displacement in the lower wall of the head of the sewing machine and is at the top edge of its lower transverse frame piece provided with two slots 34 opposing each other and which can be engaged by two pins I provided on the needle bar frame 29. Also the lower edge of the guide frame 33 is provided with two slots for the pins 31 of the needle bar frame 29, but these slots are oil'set relatively to the slots 34 and pins 35 respectively. I

In the embodiment of the machine as shown by Figs. 3 to 6 the needle feed is on principle operated in exactly the same way as in the embodiment shown by Figs. l and 2. On the main shaft I there is again loosely mounted the double eccentric 3 which is by the eccentric rods 4 and 4 connected to the rocking shafts 5, which actuate the feed dog in the well-known manner. A lever 21' corresponding to the lever 2l of the embodiment of Figs. l and 2 is attached to the rocking shaft 5, and with its top end to a crank 38 keyed to a longitudinal shaft 39. This longitudinal shaft 39 is mounted in suitable bearings 4D of the body of the sewing machine. Thefree end of the shaft 3,9 also carries a' crank 4I keyed thereto and which with a pin 42 engages a slot 43 of a double-armed lever 45 pivotally mounted as at 44 on the head of the machine. In its lower y arm the lever 45 is provided with another slot 46 in which the end of a link 41 is displaceable' but susceptible of being fixed by a knurled screw 48. This slot 46 extends Yas far as the axis 44 of the swinging movement of the lever 45 so that in this manner the swinging amplitude of the link 41 can be adjusted from nil to a maximum. At 49 the link 41 is pivoted to the needle bar frame 29 so that it imparts a reciprocating movement to the same and thus to the needle bar 2i guided therein, provided that the link 41 is secured to the lower end of the slot 46 of the levez` 45. When the k'nurled screw 48 is adjusted to a position coinciding with the fulcrum 44 of the lever 45, then the needle may carry out either the ordi: ary sewing movements, or the zigzag movement depending upon whether or not the zigzag mechanism is put into operation. However, in this position of the knurled screw no swinging movement of the needle bar in the direction of advance takes place. Between the points of attachment of the said link 41 there is pivoted to the latter another link 5I) the lower end of which is vat 5I attached to the guide frame I3. When now the link u is displaced within the e101: u of lever 45 from its extreme position into the inoperative positionhr inversely thus also the link M is taken slots 36.

along 'and caused to displace the guide frame lever is secured to the lever I5 in its lowermost position within the slot 46, the pins 35 of the needle bar frame have been disengaged from the slots 34 and on the other hand the pins 31 caused to engage the slots 36 of the needle `bar frame 33 I so that now any swinging movement of the lever V45 as produced by the means referred to will through the link 41 impart a reciprocating feed movement inthe sewing direction to the needle bar frame 29 and thus` to the needle bar 2l'. y

It is a matter of course that the means intended for producing the needle feed are so arranged that the latter takes place in a synchronous manner when cooperating with the usual .feed dog advance, which is obvious from the fact Athat the needle movements for the needle feed are derived from the same double eccentric 3 -which also actuates the said feed dog.

As already mentioned, the machine shown by Figs. 3 to 6 is not only susceptible of being changed from the ordinary sewing operation to the needle feed but also suited for zigzag stitching. 1n order that the needle is enabled to accomplish a reciprocating movement both in thev direction of Fthe needle feed and transversely thereto in the needle plate (Fig. 6), the opening intended for the passage of the needle and otherwise having the shape of ahole is replaced by a -T-shaped slot so that the needle plate need not be changed fox` the several kinds ofV stitches. To change the mode of operation of the machine from the needle feed to zigzag stitching, first the knurled screw 48 is adjusted into the position carries a cam 56 keyed thlereto and with which machine. The other end of this dou le--arn'ied- -through a connecting rod El.

coinciding with the fulcrum Il. 'Ilius the needle engages a roller 51 of a rocking lever 59 pivoted as at 58 on the arm of the machine. 'I'his rocking lever 59 is provided with a guide for an ad- :instable block El which can be secured to the 1ever 59 in different positions. To the s aid block is attached a link 6I the other end of which is pivoted to one end of va double-armed lever 63 pivotallyV mounted as at 62 on the he of the lever E3 is adapted to actuate the needle bar 2| As already mentioned. the said blockliil is slidably mounted in the guide o f the rocking lever 59. When v'the block Gil is in a position coinciding with the fulcrurn 58 of the rocking lever 59 no rocking movement is imparted to thelever 63 and thus no zigzag movement is produced. But by the block 8l extreme top position.

belng'displaced so as to have a-deiinite distance from the fulcrum 58 of the rocking lever` i', the amplitude of the zigzag stitches so be modified at will.

The zigzag movement ofthe needle iframe; 29

and the displacement of the sameis accomplished bythe means shown in Fig. 3.

What is claimed as new, is-

1. In a sewing machine, a feed dog, a needle,

means for reciprocating the needle, `means for' `advancing the feed dog in timed relation to the needle reciprocation. means oooperable with said last-named means for swinging the needle in the direction of feed dog advance, means for rendering the needle-swinging means inoperative, and means for adjusting .the timing between the needle reciprocation and the feed dog advance Sothat the `feed dog advance may be selectively caused to take place either with the needle in the work or with thev needle withdrawn from the work.

2. In a sewing machine, a feed dog, a needle, means including a. shaft for reciprocating the needle, a needle bar, means comprising an eccentric loosely vmounted on said shaft -fcr advancing the feed dog in timed relation tothe needle reciprocaticn, means releasably engaging said needle bar for swinging the needle in the direction of feed dog advance, and means for releasably securing said eccentric to said shaft in different angular-'positions thereof so that the feed dog advance may be selectively caused to take place either with the' needle in the work or with the needle withdrawn from the work.

3. In a sewing machine, the combination of claim 2, in which said last-named vmeans comprises a coupling sleeve splined on said shaft and adapted to engage with said'eccentric in the dii? ferentangular positions of the latter, and a spring normally pressing said sleeve into engage.` ment with the eccentric.

4. In a sewing machine, the combination of claim 2, in which said last-named means comprises a coupling sleeve splined on said shaft and adapted to engage with said eccentric in the different angular positions of the latter, said sleeve having a conical surface, a. spring normally pressing said sleeve into engagement with the eccentric, and a,4 pin slidably mounted in the. machine and having a cam surface adapted to said sleeve from said eccentric.

5. In a sewing machine, the combination of claim 2, said eccentric having a notch therein, and said eccentric-securing means comprising a the eccentrie,'a spring normally pressing said sleeve into such engagement, said sleeve having a conical surface, and a releasing pin having a cam surface adapted to bear against said conical surface to disengage said sleeve from said eccenv tric, said pin having also a projection adapted to engage within said notch at atirne of disengagement.

'6.- In-a sewing machlneythe combination of claim l, said needle-swinging means including.

a sectional'shaft, and said means ,for rendering the swinging means `inoperative comprising a separable couplingfor the sections of said shaft.

7. In a sewing machine, a feed dog, a needle,

' means forV reciprocating the needle, means for advancing the feed dog in timed relation to the needle reciprocation, means for selectively swinging the needle either inthe direction of feed dog advance or in a transverse direction for effecting .bear against said conical surface to disengage y 65 l 5 sleeve splined on said shaft and engageable withv stitches,` means forrendering the needleswinging meanslinoperative, and means for wad- -justing the timing between the needle recipro.

cation and the feed dog advance so that the feed dog advancemay be selectively causedfto take place either with the needle in the work or with the needle withdrawn from the work.

8. In a sewing machine, a feed dog, a needle, a

A :needle bar, a needle bar frame, a universal-joint 10 u -..r`eciprocating the needle barrwithin said needle bar frame, means for advancing the feed dog in @timed relation totheneedle reciprocation, means mounting for said needle bar frame, means for for selectively swinging. the needle bar either in the direction of feed dog advance or in a trans` verse direction or securing it against any swinging, and'means for adjusting the timing between the vneedle reciprocation and the feed dog advance so that the feed dog advance may be selectively caused. to take place either with the needle in the work or with the needle withdrawn from the work.

9. In a 'sewing machine, the combination set forth -in claim '1, together with means operative during each swinging movement for ypreventing swinging movement in any other direction.

10. Ina sewing machine, the combination -set forth in claim 8, together with means operative during each swinging movement for preventing swinging movement in any other direction, said last-named means comprising a vertically shiftable guide frame enclosingthelower endof theneedle bar frame, said guide frame having a pair of aligned slots in its upper edge and a second pair of aligned slots in its lower edge, said second pair of slots being angularly offset with respect to the first-mentioned pair, a pair of pins carried by the needle bar frame and adapted to engage with the upper slots when the guide frame is raised, and a second pair of pins carried by the needle lbar frame and adapted to engage with the lower slots when the guide frame is lowered.

1l. In a sewing machine, the combination set forth in claim 8, together with means operative during each swinging movement for preventing swinging movement in any other direction, said last-named means comprising a vertically shiftable guide frame enclosing the lower end of the needle bar frame, said guide frame having a pair of aligned slots in its upper edge and a sec :ond pair of alignedslots in its lower edge, said second pair of slots being angularly offset with respect to the first-mentioned pair, a pair of pins carried by the needle bar frame and adapted to engage with the upper slots when the guide frame tively swinging the needle bar in the direction of feed dog advance or in a transverse direction;

said feed dog advancing means' including a shaft and an eccentric thereon;v said swinging means for swinging the needle bar in the direction of the work comprising a double-armed lever with a slot in one arm thereof, means for transmitting the Veccentric movement to the unslotted lever arm, a link pivoted to the needle bar, means for adjustably securing the other end of said link in said slot; and means operative during said swinging movement to prevent swinginglin any other direction, said means including a vertically shiftable guide frame enclosing the lower end of the needle bar, and a link pivotally extending between a, midportion of said first-named link and said guide frame.

13. In a sewing` machine, a feed dog, a needle, a needle bar, means for reciprocating the needle, means vfor advancing the feed dog in timed relation to the needle reciprocation, means for selectively swinging the needle bar in the direction of feed dog advance or inv a transverse direction; said needle-reciprocating means including a shaft; said swinging means for swinging the needle bar in a transverse direction comprising a cam on said shaft, a rocking lever with a slot therein, said slot extending over the fulcrum of said lever, a cam follower on the end of said lever, a block slidably mounted in said slot, and links operatively interposed between said block and the needle bar, the amplitude of swing being variable upon shifting the position of said block, and said amplitude being zero when the block is positioned over the fulcrum of said rocking lever.

ANTON HANDSCHUE 

